<!DOCTYPE html>
<html>
    <meta charset="utf-8">
    <title>text-decoration-thickness invalidation reference</title>
    <style>
        :link {
            text-decoration: underline;
            text-decoration-thickness: 3px;
        }
    </style>
    <p>The link below should increase its underline thickness when hovered:</p>
    <div style="font-size: 28px;">
        <a href="#" id="link">Hover me</a>
    </div>
</html>
